Electric heating-pad.



No. 836,232. PATENTED Nov. 2o, 1906.

L'. W. SEELLEAMEE.

ELECTRIC HEATING EAD.

APPLICATION FILED APR. 2. 1906.

:mms rimes. luc.. Lxmo.. msmavuu. n c,

wir@ y li lille earner QFFIGE f '.pfecieation of Letters Patent.

'ifa leerme-Pee...

Patented Nov. 2o, 190e.

'pplication filed Ilpril 2, 1906. Serial No. 309.456.

To all when@ t indy concern:

Be it lmownwthatjl, LUELM. W'. SHELL- HnME-n, a citizen ofthe 'United States, reeiril- .ing at Los Angeles', in the county of Los An- .gelesfand State or' California, have invented. .Y useful iinproyenier in `Electric gjlad@ oil'wliieh the rollo". eincation. My invei'ition relates, priinnrily, vproveinents in heatingpads for applyin A tiiicial heat generated by electricity the human body 3 and it is the object of iny im provcinent to produce a heating-psid whioli will quickly 'furnish the .required degree oi' heat and wliiel'i will have the inrrent antoinatically cut oli' wh 'n the person izsiof .it gets oil' the saine. l s oniplish this o bythe mechanism deecrioed herein a illi.s tinted in the accompanying drawings, in which-Q A lFiggt're 1 is a perspective view, with 'parte breken away .for elearnees ol illistration, of .my improved heatingpad. Fig. 2 is a seetion-on the line 2 Z oi Fig. 1 olf one of the ere `reiit;eonti'olliiig means.

.n, the drawings, 3 is the hase or bod y of the pad, preferably of flexible non-conduct- .ive material' and preferably oi? non-coni bilstible material, as well. On the Upper surface ol' the body and .i .erred thereto is a lsuitable amount of reelstance-wire 11, preferv ably provided with'insulation,. Whieh runs Abaclward and forward longitudinally or transversely vthe body -and continiinisly, except that at Sonie point therein, preferably at 'the center and at the i1 pper end thereof, it is broken, and the broken ends are seeired one to a spring-contact 5 and the other end to a spring-contact which contacts are secured to a nonhliexible base 7, of insulating material, preferably fiber, which extends across the upper end. of the body. To this insulated base is hinged a movable leaf 8, preferably of nonconducting material, wliieh carries a stud 9, which when the leaf is pressed downwardly, as hereinafter exf 5 and. 6 and plained, engages the Contacts closes the breakin the wire.

tud 9 is secured iipon the end of bar 10, which bar is secured to the leal.2 8 and has a hin e at 11 therein. A light wire spring 12 is a so secired to leaf S, and the free end thereof engages bar 10. The free end ol leaf 8 is normally held in its elevated position `5 by springs 13, of which there is preferably one'at each end. Surrounding 'the pad is a "l n or cover 114.-. The terminals of wire 4 are s. red. to a plug 15, which is adapted to i. ethe Vsaine to a source of electrical ene ln the drawings l have 'shown this p w Liflapted to be screwed into an elecniiet. At any suitable point on the re ire wire is a inake-an l.-break switoh 1S, eh is placed thereon, so as to be .reale ily aeeessible to `the person ising the pad. l

ln rising my device 'the pad will be placed upon a eoncli and. the. plug connected to e' sonrce oi electrical energy. The 'person dethe pad wi ll then liedown upon elosing the movable lealV down upon. lthe base .7 and vcatsiiig stud 9 to engage contacts 5 and (i. .lle will then operate switch l@ so'as to close the circuit il the isnot already closed. Whenever the heat reaches high '1 degree as .he wishes, he will break the circuit at switch 16 in the usual manner, andA when the pad. cools he will elo-se -the circuit again and continue to ope it as long as he desires. As soon as he has iinished. ns1 ng the pad if he should forto breek the circuit at switch 1.6 when he gets oil the pad springs 13 will caise the 'free end. el' leal S 'to bring stud 9 out of engagenient with contacts 5 and 6, thereby breaking the circuit, and. thus preventing the pad from burning up or becoming injured, as has frequently happened with padsA of this chan acter not provided with my improvement. ln order to make a quick break between stud 9 and contacts 5 and (l, l 'provide that the enoagenient tl'xerebetwcen shall be such that.

the bai' 1Q will turn on its hinge until it engages the turned-over end 17 of the stop 17, which permits springs 13 to then withdraw sind 9 from said contacts. As soon as the stud .is free to move spring 12 throws the bar 1einst 'the leali, as shown in Fig. 2, thus ina-king .e qiiiek break and avoiding injurious sparking.

The outer end of the bar 10 may be held against lateral movement by stops 1S, of whieh there are two, one on each side of the bar.

By placing the resistance-wire upon 'the top of the body of the pad and not enibedding the sanieinthe body or Weaving itinto the body l provide a heating-pad in which heat may be more quickly applied than the 'resistance-wire is embedded in the body of ITO the pad, and by having a switch that. is oper-4 ated by the Weight, of the person using the pad to close :L breek in the resistance-wir@ :ind by having Springs which will :internatio- :illy cause :i breek in the resistmlce-Wire :LS soon as the weighty of the person lusing the sii-lne is removed from thopad l. have provided e.y pzml that is absolutely safe againstJ occidental burning in the hands of the eareless or ignorent.

Having ilescribml my invention, what l. An electric heating-ond comprising :L ilexible body; insulated resistance-Wire sev'ererl rpon the srrl'zure of sezifl borly; means for attaching s;i l resistance-wire to :i soiiree of electrical energy; :ind ineens for control ling the current'. thi-oi `h seid resistenre-wile,

2. An eleetrie healing-pwd comprising e flexible body; insirletcrl resistn|\ -e-\\'ire se- Ci'red Upon the snrlziee ol` said body and leying` :i breek-in said resistzinco-wireg ineens operzitnble by the right ol' the rser ol' seirl nml to close szviil br `:ik: nxczins to reestablish smid break when the user gels oll' the paul; means for attaching said resistaneewire to a source of electrical energy.

3. An electric A"heatingepnd comprising :L Ilexible body 5 insulated resistance-wire secured upon the Surface of said body und having' n break in seid resistance-Wire; means ope'rzitable by the weight of the user of the paul to elose said breuk; ineens to reestablish said break when the user removes from the paid; ineens fo zittaching said resistance-wire to n six-ree of electrical energy; and ineens for controlling the circuit through, said wire.

4. `In :in electric heating-pad a resistance- Wire havingr :i breek therein; Ineens operant- :Lble h y the weight; of the user to close snirl break; and ineens to reistriblish smid break when the eser removes from the pmi.

In witness that l elziizn the foregoing l have herennto subscribed my nume this 24th (My of Mzireh, 1906.

LUICIJLA W. SHELLHAMER.

Vitnesses: I

G. IG. HARPHAM, Unxm' l. ILV/anu 

